Cool man, I'll keep you updated. Immortal Revolt rules for releasing this. I wish I could ask him some questions.

I've also got a design in the works for a spring loaded extractor. The 1911 style one works but can scrape the shells a bit, or at least it does with how I made mine... I have also modified the Mendendez v3 magazines to fit in the Rogue-9... I'm thinking metal feed lips plus an anti-warp carbon nylon on the mags and you'll be able to keep them loaded with ~15 rounds indefinitely without the spring pressure eventually warping... I'm wondering why the two bottom 4mm threaded guide rods weren't moved out to the sides to avoid intersecting the can. On the subject of can, the docs said there was another option to be released in late 2025 but haven't seen anything... Finally, and a super simple fix, I added a 3mm steel rod from the materials list to reinforce the mag release. It's a known issue on FGC9 style lowers that it eventually snaps out under spring pressure.

Theres a ball bearing detent delayed ump called the holdup i tried. The detents were threaded on the outside to allow for adjustment without having to reprint the entire frame like you'd have to were they secured in cups. Its a viable idea HOWEVER theres a serious issue with inconsistencies between individual detents from amazon. the detents i bought had tension inconsistencies between ones from the same package if that gives you in idea of what you may get from amazon. they also wouldn't last longer than a few hundred rounds before the ball bearing would pop out and cause the bolt to wedge itself immobile. dont cheap out on these if you decide to try this

The bolt has to overcome the resistance of the bearings and push them into their recesses. This delay will hopefully reduce the amount of gasses escaping from the breech. This is also what the "Scropion Evo Gen 2" drop-in receiver does and that has been very popular (recoil impulse and suppression improved). That's also just two spring loaded bearings working against the bolt. By comparison, it's not as intricate as something like the "Mean Arms Bearing Delay" which has a mechanical disadvantage by pushing a shaft/bolt out of the way before the bolt carrier can move.

I read on a random comment somewhere that the Urutau developer was trying to implement a delayed action. Is anyone aware of work in this area? The null-22 developer also has a video working on a delayed blowback mechanism that features more of a mechanical disavantage design, but it looks like it relies on a lot of plastic on plastic in the bolt.